﻿<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>去掉超链接点击时的框</title>
    <style>
        a {
            aa:expression(onfocus=function() {blur();});
        }
    </style>
</head>
<body>
单击下面的链接，测试是否会出现边框
<br />
<a href="#">单击这里</a>
</body>
</html>